JP2949623B1 - How to build a tunnel - Google Patents

Abstract

An object of the present invention is to provide a method capable of constructing a tunnel safely and inexpensively while minimizing the influence on the ground surface. SOLUTION: The earth and sand on the upper part of the construction range of a tunnel is cut in a state including a part of the upper section of the tunnel. Concrete is cast on the bottom of the excavated section, leaving the top shape of the tunnel, to form a ceiling block. Build the rest of the tunnel at the bottom of the ceiling block.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a tunnel construction method.

[0002]

2. Description of the Related Art Conventionally, when a tunnel is constructed at a position shallow from the ground surface, an open-cutting method is generally used, and when cutting is difficult, a chemical injection or a pipe roof method is used.

[0003]

The conventional tunnel construction method as described above has the following problems. <B> In the excavation method, it is necessary to perform protection work over a wide range in order to prevent unequal settlement or inclination of facilities surrounding the excavation part. Excavation cannot be performed unless the use of surface facilities is restricted for a long period of time. <B> The pipe roof method and the chemical liquid injection method tend to affect the ground surface and may cause environmental pollution.

[0004] The present invention has been made to solve the above-mentioned conventional problems, and has as its object to provide a method for constructing a tunnel at a low cost with a minimum effect on the ground surface. I do.

[0005]

In order to achieve the above object, a method for constructing a tunnel according to the present invention is directed to a method for constructing a tunnel including a part of an upper cross section of a tunnel in which an upper portion of a tunnel is constructed. A method of constructing a tunnel, in which a ceiling block is formed by casting concrete on the bottom of the excavated part while leaving the top shape of the tunnel, and then constructing the remaining part of the tunnel under the ceiling block It is characterized by.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a tunnel construction method according to the present invention will be described below with reference to the drawings.

<A> Opening of the upper part of the tunnel. The excavated part 1 is formed by excavating the earth and sand in the upper part of the area where the tunnel is to be constructed. In this case, the excavation unit 1 performs excavation while including a part of the upper cross section of the tunnel to be constructed. (Fig. 1)

<B> Formation of a ceiling block. On both sides of the bottom surface of the excavated portion 1, for example, concrete is poured into the shape of a road curb or the shape of a foundation of a retaining wall to form a support support 2. (FIG. 2) An arc-shaped support 3 is installed in a state of being bridged over the support supports 2 on both sides thus formed. (FIG. 3) The spacing between the supports 3 is arranged in accordance with the dimensions of the formwork 4, and the formwork 4 is installed between the adjacent supports 3. (FIG. 4)

<C> Casting concrete. Concrete is cast on the formwork 4. Then, with the upper part of the tunnel left on the bottom of the excavation part 1,
A ceiling block 5 made of concrete can be formed. (Fig. 5)

<4> Driving a support pile. After the formation of the ceiling block 5, a boring machine 6 is installed on the upper surface of the ceiling block 5. Then, holes are drilled toward the outer periphery of the construction area of the tunnel, and a number of support piles 7 are driven in parallel. (FIG. 6) When the placing of the support pile 7 is completed, the upper surface of the ceiling block 5 is buried back to restore the state before the excavation. (FIG. 7)

<E> Construction of tunnel. The tunnel 8 is constructed within a range where the upper part is protected by the ceiling block 5 and the side surface is protected by the support pile. (Fig. 8) In this case, the upper arch of the tunnel 8 is already constructed as a ceiling block 5, so the ground is gradually lowered, the side walls are cast, and then the bottom is constructed to complete the tunnel 8. I do.

[0012]

As described above, the tunnel construction method of the present invention has the following advantages. <B> Construction of the tunnel ceiling can be completed by excavation from the ground with simple equipment. Therefore, tunnel excavation costs can be reduced. <B> When constructing the tunnel, there is no danger of earth and sand collapse since the construction of the ceiling of the tunnel has been completed in advance. <C> When used for widening an existing tunnel, it is safe because a large excavator does not ride on a general vehicle protection shelter in the existing tunnel. <D> Because the ceiling of the tunnel has already been completed,
Subsequent excavations can be constructed at a price as low as the lower half of the excavation. <E> When the construction and backfilling of the ceiling of the tunnel is completed, the lower half of the tunnel can be constructed with the ground part open to the general public, such as ordinary traffic.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of an embodiment of a tunnel construction order according to the present invention.

FIG. 2 is an explanatory diagram of a construction order.

FIG. 3 is an explanatory diagram of a construction order.

FIG. 4 is an explanatory diagram of a construction order.

FIG. 5 is an explanatory diagram of a construction order.

FIG. 6 is an explanatory diagram of a construction order.

FIG. 7 is an explanatory diagram of a construction order.

FIG. 8 is an explanatory diagram of a construction order.

Claims (3)

(57) [Claims] 1. The earth and sand in the upper part of the construction area of the tunnel is cut and cut in a state including a part of the upper cross section of the tunnel, and concrete is cast on the bottom part of the cut part while leaving the top shape of the tunnel. A method of constructing a tunnel by forming a ceiling block and building the rest of the tunnel below the ceiling block 2. The tunnel construction method according to claim 1, wherein after the ceiling block is formed, a support pile is driven toward the outer periphery of the tunnel construction area. 3. A support work is formed on both sides of the bottom surface of the cut-out portion, a support and a formwork are installed on the support work, and concrete is cast on the formwork. Item 1. A tunnel construction method according to item 1.